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Revenue - Receivables (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total customer receivables | $ 318,057 | $ 313,719
Unbilled receivables | 10,877 | 14,492
Billed receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total customer receivables | $ 307,180 | $ 299,227

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